How do i find at least one set of values for x and y so that the slope of the line through (5,8) and (x, y) is 0?

Find the indicated value, where g(t) = t^2-t and f(x)= 1+x a. -2 b. 0 c. 2 d. 8

The spotter on the ground is standing beneath the safety net. what is his distance from the base of the platform, to the nearest meter? 3 meters, 2 meters, 4 meters, 1 meter?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'